P0725

Electronic Ignition (EI) System DTC P0725 ENGINE SPEED SIGNAL

Description
The engine speed signal is sent from the ECM to the TCM.





ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE





CAUTION: Always drive vehicle at a safe speed.

NOTE: If DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE has been previously conducted, always turn ignition switch OFF and wait at least 5 seconds before conducting the next test.

After the repair, perform the following procedure to confirm the malfunction is eliminated.

With CONSULT-II
1. Turn ignition switch ON and select DATA MONITOR mode for ENGINE with CONSULT-II.





2. Start engine and maintain the following conditions for at least 10 consecutive seconds.
VHCL SPEED SE: 10 km/h (6 MPH) or more
THRTL POS SEN: More than 1.2V
Selector lever: D position (OD ON)

With GST
Follow the procedure With CONSULT-II.

Wiring Diagram-AT-ENGSS

AT-ENGSS-01:

AT-ENGSS-01

Diagnostic Procedure
1. CHECK DTC WITH ECM
Perform diagnostic test mode 11 (self-diagnostic results) for engine control. Check ignition signal circuit condition.
OK or NG
OK (With CONSULT-II)>> GO TO 2.
OK (Without CONSULT-II)>> GO TO 3.
NG >> Check ignition signal circuit for engine control. Refer to INPUT/OUTPUT SIGNAL CHART.

2. CHECK INPUT SIGNAL (WITH CONSULT-II)

With CONSULT-II
1. Start engine.
2. Select TCM INPUT IT SIGNALS in DATA MONITOR mode for A/T with CONSULT-II.





3. Read out the value of ENGINE SPEED.
Check engine speed changes according to throttle position.
OK or NG
OK >> GO TO 4.
NG >> Check the following items:
- Harness for short or open between TCM. and ECM
- Resistor and ignition coil
Refer to SYSTEM DESCRIPTION. Electronic Ignition (EI) System

3. CHECK INPUT SIGNAL (WITHOUT CONSULT-II)

Without CONSULT-II
1. Start engine.





2. Check voltage between TCM terminal 39 and ground.
Voltage (Idle speed): Refer to TCM Terminals and Reference Value.
OK or NG
OK >> GO TO 4.
NG >> Check the following items:
- Harness for short or open between TCM and ECM
- Resistor and ignition coil
Refer to SYSTEM DESCRIPTION. Electronic Ignition (EI) System

4. CHECK DTC
Perform AT-131, DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE.
OK or NG
OK >> INSPECTION END
NG >>
1. Perform TCM input/output signal inspection. Pinout Values and Diagnostic Parameters
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.